Sound Flashcards
Light and water waves are what type of waves
Transverse
Sound is what type of wave?
Longitudinal
True or False, sound waves have vibrations that are parallel to the direction of the wave?
True - Longitudinal wave vibrations are parallel to the direction of the wave.
Are the vibrations in Longitudinal waves parallel to the direction of energy transfer?
Yes
Fill in the missing word:
Sound travels as a Longitudinal P_______ Wave
Sound travels as a Longitudinal Pressure Wave.
Why does sound require a medium to travel through?
Something has to pass on the sound vibration.
Why can’t sound travel in space?
Space is mostly a vacuum, which means there are no particles to pass on the vibrations.
Vibrations are passed through mediums as a series of what?
Compressions.
What are compressions in sound waves?
regions of squashed up particles.
Can sound be reflected and refracted like light?
Yes
Give an example of a sound reflection.
Echo
Give an example of objects around the home that absorb sound easily.
Soft furnishings - Carpets, curtains.
Does the medium that sound is passing through affect the speed at which it travels?
Yes
Fill in the missing words:
The ____ particles there are, the faster a sound wave ______.
The MORE particles there are, the faster a sound wave TRAVELS.
Does sound usually travel faster in solid or gases?
Solids
Does sound usually travel faster in more or less dense mediums?
More
Does sound or light travel faster?
Light
Does sound travel faster in Wood or Water?
Wood.
The frequency of sound can be described as the number of complete _______ that pass a point per second.
waves
Does high or low frequency mean more vibrations per second?
High
What is frequency measure in?
Hertz (Hz)
Hertz (Hz) is the number of what per second?
vibrations.
Put the following stages of hearing sound in the right order:
A)Ear Bones vibrate
B) Object vibrates
C) Ear drum vibrates
D) Hairs vibrate in the cochlea, sending a mesage to the brain along the auditory nerve.
E) Air Vibrates
B, E, C, A, D
What is described here:
The range of frequencies that you can hear.
Auditory range.
What is the typical auditory range of humans?
20 - 20,000 Hz
Can humans typically hear high pitched sounds above 20,000 Hz?
No
Do all humans have the same auditory range?
No
Can animals like dogs and bats usually hear higher frequency sounds than humans?
Yes
Can dolphins usually hear lower pitch sounds than humans?
No
Is the pitch of sound different to the frequency?
They are related, but pitch is a perceptual quality, while frequency is the scientific measurable attribute of the sound.
How do sound waves transfer energy and information from one place to another?
by vibrations between particles - pressure changes.
What is the name of the thin membrane of material within a microphone that receives the sound wave vibrations?
A diaphragm
What does a microphone convert sound wave vibrations to?
Electric signals
What does the the recording of electric signals from a microphone allow us to do?
reproduce the sound later.
What do loudspeakers do?
Recreate sound waves from electrical signals
What does a loudspeaker use to vibrate the air and reproduce sound waves?
a diaphragm
What is ultrasound?
High frequency sound that we can’t hear - higher frequency than the normal auditory range of humans - Sound over 20,000Hz
What is ultrasound cleaning?
the frequent vibrations of the pressure waves dislodge dirt in difficult to clean cracks.
Give an example of items that are sometimes cleaned using ultrasonic cleaning.
Jewellery, teeth, fountain pen nibs
What is Ultrasound physiotherapy?
Ultrasound pressure waves transfer energy through matter, and can reach inside the body.
Some physiotherapists believe that ultrasound therapy can treat difficult to reach muscles and tendons inside the body, do scientists agree?
No, scientists have found little evidence that this is an effective treatment.
